As long as it's in the private cat then a UK LAME can certify the annual. The Licence MUST be type (or group) rated for the particular airframe/engine combination.
As it is an annual it will ALSO require a radio certification. Unless this guy is A/C & R you will need an additional person to certify. He'll need some test equipment too. Pitot/static checks (A&C) and radio/radar (R) checks are all required on an annual.